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Unveiling the Hidden Performance of Whole Cells in the Asymmetric Bioreduction of Aryl‐containing Ketones in Aqueous Deep Eutectic Solvents
Author(s) -
Vitale Paola,
Abbinante Vincenzo Mirco,
Perna Filippo Maria,
Salomone Antonio,
Cardellicchio Cosimo,
Capriati Vito
Publication year - 2017
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201601064
Subject(s) - chemistry , choline chloride , biocatalysis , enantiomer , aryl , aqueous solution , eutectic system , solvent , selectivity , organic chemistry , green chemistry , deep eutectic solvent , combinatorial chemistry , ionic liquid , catalysis , alkyl , alloy
In this contribution, we report the first successful baker's yeast reduction of arylpropanones using deep eutectic solvents (DESs) as biodegradable and non‐hazardous co‐solvents. The nature of DES [ e.g . choline chloride/glycerol (2:1)] and the percentage of water in the mixture proved to be critical for both the reversal of selectivity and to achieve high enantioselectivity on going from pure water (up to 98:2 er in favour of the S ‐enantiomer) to DES/aqueous mixtures (up to 98:2 er in favour of the R ‐enantiomer). As a result, both enantiomers of valuable chiral alcohols of pharmaceutical interest were prepared from the same biocatalyst by simply switching the solvent. The possible inhibition of some ( S )‐oxidoreductases making part of the genome of such a wild‐type whole cell biocatalyst when DESs are used as co‐solvents may pave the way for an anti ‐Prelog reduction. The scope and limitations of this kind of biotransformations for a range of aryl‐containing ketones are also discussed.